Toyota 17141-37150 Exhaust Manifold

1. Connect a vacuum gauge to an intake manifold vacuum source. 2. Warm the engine to operating temperature, place the transaxle in Park (automatic), and apply the parking brake. 3. Note and record the vacuum reading at idle. 4. Quickly open the throttle to near full throttle and release it shut, then note and record the vacuum reading. 5. Perform the test three more times, recording the reading after each test. 6. If the reading after the fourth test is more than one In-Hg lower than the reading recorded at idle, the exhaust system may be restricted (the catalytic converter could be plugged or an exhaust pipe or muffler could be restricted).

Apply penetrating oil to the bolts and springs retaining the exhaust pipe to the manifold. After the bolts have soaked, remove the bolts retaining the exhaust pipe to the manifold. Separate the front exhaust pipe from the manifold, being careful not to damage the oxygen sensor. Note: It may be necessary to remove the inner heat shield from above the right drive axle to access one of the exhaust pipe-to-manifold bolts.